有以下程序#includemain( ){FILE *fp; int i, a[6] = {1,2,3,4,5,6};fp=fopen("d2.dat", "w+");for(i = 0; i < 6; i++)fprintf(fp, "%d\n", a[i]);rewind(fp);for(i = 0; i < 6; i++)fscanf(fp, "%d\n", &a[5 - i]);fclose(fp);for(i = 0; i < 6; i++)printf("%d,", a[i]);}程序运行后的输出结果是

A．4,5,6,1,2,3,

B．1,2,3,3,2,1,

C．1,2,3,4,5,6,

D．6,5,4,3,2,1,